well..someone who knows a little bit of banking laws would agree to it…they shud not be given a normal cheque book…instead there are other ways to fecilitate money transfer to them..like voice based password recognition…or braile..something of that sort. Coz it becomes the responsibility of bank to ensure that the money is discharged to the rightful owners on the bases of proper and accurate identification marks like signatures…!! so if the coustomer agree to bind himself to the bank that he would honour the mark…there would sure be no hassle…but otherwise..safeguard is required!!